Following commit added suport the CPU quota/period to the LXC driver.
Update the documentation to reflect that.

	commit d9724a81
	Author: Daniel P. Berrange <berrange@redhat.com>
	Date:   Thu Nov 10 12:16:26 2011 +0000

	Add support for CPU quota/period to LXC driver
Signed-off-by: NSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>